Robert Duane Ballard (born June 30, 1942 in Wichita, Kansas) is a former commander in the United States Navy and an oceanographer who is most noted for his work in underwater archaeology. He is most famous for the discoveries of the wrecks of the RMS Titanic in 1985, the battleship Bismarck in 1989, and the wreck of the aircraft carrier USS Yorktown in 1998. Most recently he discovered the wreck of John F. Kennedy's PT-109 in 2003 and visited the Solomon Islander natives who saved its crew. Ballard is also great-grandson of American Old West lawman Bat Masterson.
from wikipedia.org
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